Abstract: A traffic control system includes: a vehicle detection sensor (CS) for detecting a vehicle on a road; a traveling speed command indicator (VI) for indicating a traveling speed command to the vehicle on the road; a vehicle train detection means (104) for detecting a vehicle train in which vehicles range with each other within a predetermined inter-vehicle distance; a packet formation control means (106) for indicating a traveling speed command to form a packet having predetermined vehicle train length and inter-vehicle train distance for the vehicle on the road; a packet traveling control means (108) for indicating a traveling speed command so that the packets from respective direction can pass an intersection efficiently; and a traffic signal control means (114) for controlling a traffic signal in conjunction with a packet arriving at the intersection under control of the packet traveling control means.